[c-nsp] SSH no longer functions after hostname change

[Jon Wolberg]

All-

Using the exact order that JF listed below it worked perfect and resolved my issue.  I can now SSH to this device again.

Thanks.


Jon Wolberg
Systems Engineer
Virtacore Systems Inc.
"We Virtualize IT!" 


----- Original Message -----
From: "jf" <jf at emich.edu>
To: "Jon Wolberg" <jon at defenderhosting.com>
Cc: cisco-nsp at puck.nether.net
Sent: Monday, August 10, 2009 12:42:00 PM GMT -05:00 US/Canada Eastern
Subject: Re: [c-nsp] SSH no longer functions after hostname change

We experienced this problem on a 3550 12g several years ago.  We solved
it by temporarily changing the configured hostname back, zeroing the
key, changing the hostname again, and regenerating.

Jon Wolberg wrote:
> Hello-
>
> We recently changed some of our hostnames on various legacy switches to follow our naming convention, and after one change I can no longer SSH to the switch.
>
> I get the below errors on the console with debug ip ssh client running:
>
> Aug 10 11:23:44 EST: SSH5: sent protocol version id SSH-2.0-Cisco-1.25
> Aug 10 11:23:44 EST: SSH5: protocol version id is - SSH-2.0-OpenSSH_4.3
> Aug 10 11:23:44 EST: SSH2 5: RSA_sign: private key not found
> Aug 10 11:23:44 EST: SSH2 5: signature creation failed, status -1
> Aug 10 11:23:44 EST: SSH5: Session disconnected - error 0x00
>
> I zero'ized the old keys and re-generated as well as set the hostname back to the original and zero'ized and re-generated to no avail.  Nothing shows up on Google and I can find no errata related to SSH access on the version of code we are running.
>
> Has anyone encountered this before?  This is a 3750 running 12.2(44)SE2
>
>
> Jon Wolberg
> Systems Engineer
> Virtacore Systems Inc.
> "We Virtualize IT!"
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